An explanation of the causes why vaccination has sometimes failed to prevent small-pox: and also a description of a method confirmed by experience, of obviating such causes. (Part the second.) / [Edward Leese].

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An explanation of the causes why vaccination has sometimes failed to prevent small-pox: and also a description of a method confirmed by experience, of obviating such causes. (Part the second.) / [Edward Leese]. Public Domain Mark. Source: Wellcome Collection.